the seven-day forecast, upper 80's today, mid 80's tomorrow. rain chances go up tomorrow, higher chance for scattered showers extending into monday and tuesday. this is is an on-again, off-again thing as the remnants of isaac try to move across the area. >> a deadly lung disease hangs over one of america's most popular getaways. details on the yosemite virus exposure. >> a bus holiday weekend for travel as gas prices are going up. i'm kim dacey with details next. >> have you noticed problems with allergies? find out >> time right now, 5:19, 78 degrees on tv hill. in this morning's medical alert, while the heat is welcome, allergy sufferers are having a horrible time of it. there's more than one reason why. >> several people brave the heat for the last thursdays on first but it wasn't just the temperature causing discomfort. >> allergies are horrible. absolutely horrible. i've been miserable, sneezing, running nose. >> emily schultz innocent alone. >> you get stronger headaches, you feel puffy. >> what's causing the increase in allergies? dr. da